- "You don't follow me, friend. You follow this. The Ren. The Ren doesn't stop to worry about what it's burning or the right or wrong of it, or the goals it might achieve. The Ren just is. It lives, and it consumes, and it doesn't apologize. It is its nature and nothing else. I believe in that principle on a deep, deep level. In fact, I've dedicated my life to it."
- ―"Ren," to Karrst and Filin
The Ren was the name given to a red-bladed lightsaber wielded by Ren, the leader of the Knights of Ren. Ren believed in an ideology based on the lightsaber, in which the Ren was simply "its nature, and nothing else," and that the Ren had no remorse and was not concerned with right or wrong or the goals it might achieve. Because of this ideology, the Knights of Ren followed a flexible code, living life the way they wanted, taking what the galaxy gave them, and consuming what the dark side sent them without any further thought or consideration.
- The Rise of Kylo Ren 1 (First appearance) (Appears in flashback(s))
- The Rise of Kylo Ren 2 (Appears in flashback(s))